2-amino-1-(2-imidazolin-2-yl)-2-imidazolines

ABSTRACT

The present invention relates to 2-amino-1-(2-imidazolin-2-yl)2-imidazolines, the free base of which has the following structural formulas:   WHEREIN R1 is hydrogen, lower alkyl, cycloalkyl, aryl, substituted aryl, heterocyclic, substituted heterocyclic or aryloxy; R2 is hydrogen, lower alkyl, aryl and substituted aryl; OR R1 and R2 taken together with the nitrogen atom to which they are attached from a heterocyclic ring; R3 and R4 are hydrogen, lower alkyl, aryl, or substituted aryl; R5 is hydrogen, lower alkyl, aryl or substituted aryl; N IS AN INTEGER FROM 0 TO 10. The compounds of this invention are useful as antiarrhythmic agents as well as antibacterial agents.

United States Patent Wittekind et al.

[ Z-AMINO-l-(2-IMIDAZOLIN-2-YL)-2- IMIDAZOLINES [72] Inventors: Raymond R. Wittekind, Morristown; .Iohn

Shavel, Jr., Mendham, both of N ..l.

[73] Assignee: Warner-Lambert Company, Morris Plains 221 Filed: .Ian. 28, 1970 2| Appl.No.: 6,639

[52] U.S. Cl. ..260/296 R, 260/2475 R, 260/2917,

260/309.6, 424/263, 424/267, 424/273 [51] Int. Cl. [58] Field of Search ..260/296 R [56] References Cited UNITED STATES PATENTS 3 ,35 9,2 74 12/1967 Billinghurst ..260/296 Primary Examiner-Alan L. Rotman Attorney-Albert H. Graddis, Henry E. Millson, .lr., Frank S. Chow. Neil D. Edwards and Anne M. Kelly [5 7] ABSTRACT The present invention relates to 2-amino-l-(2-imidazolin-2- 51 3,666,767 [4 1 May 30, 1972 yl)-2-imidazolines, the free base of which has the following structural formulas:

The compounds of this invention are useful as antiarrhythmic agents as well as antibacterial agents.

3 Claims, No Drawings Z-AMINO-1-(2-INHDAZOLIN-2-YL)-2-IMIDAZOLINES tions by groups such as, hydrogen, halogen, lower alkyl and lower alkoxy. The term aryl" denotes a monocyclic or The present invention relates to 2-amino-l-(2-imidazolin-2- bicyclic hydrocarbon radical, preferably of six to 10 carbon yl)-2-imidazolines having the following structural formulas: atoms, such as for example, phenyl, naphthyl and the like. The R R0 term substituted aryl" as used herein includes aryl as defined N N above in which one or more of the hydrogen atoms of the aryl R1( H:)FN 1"( portion have been substituted by groups such as, halogen, f hydroxyl, lower alkyl, trifluoromethyl, amino, substituted N amino or lower alkoxy. X, in the formulas below, includes R6 N I RFN I 10 anions such as the halides, for example, fluoride, chloride, T iodide, bromide, or other anions such as, sulfate, nitrate, 4 3 phosphate, maleate,fumarate and the like. wherein The definitions for R R R R and R and n as used R is hydrogen, lower alkyl, cycloalkyl, heterocyclic, subhereinafter have the same meanings as defined above.

stituted heterocyclic; aryl, substituted aryl, or aryloxy; The compounds of this invention exhibit antiarrhythmic ac- R is hydrogen, lower alkyl, aryl, substituted aryl, tivity, for example, at a dosage of about 2 to 3 mg/kg, body or R and R taken together with the nitrogen atom to which weight in a mammal such as, cats, dogs, monkeys, and the like. they are attached form a heterocyclic ring, for exam le a In experimentally induced arrhythmia, such as those induced 5- or b d i by ouabain, at a dosage of2 to 3 mg/kg, the compounds ofthis R and R are hydrogen, lower alkyl, aryl or substituted my]; invention are capable of arresting such arrhythmia. Generally R is hydrogen, lower alkyl, aryl or substituted aryl; speaking, the compounds of this invention are useful in condin is an integer from Oto l0. tions associated with cardiac arrhythmia. A dosage level of I h d fi i i f r R R R R d R th term l about 1 to 10 mg, several times daily is recommended. This alkyl includes lower aliphatic hydrocarbons having one to 10 dosage regimen can be Varied according t0 y g carbon atoms in the carbon chain. It includes straight chain as species of the mammal being treatedwell as branched chain radicals. The term also includes, for Among the dosage forms Which n be s o administer example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl and these compounds for example, table's, Powders, Elixirs, the like. The term cycloalkyl encompasses saturated o suspensions and the like. These dosage forms are formulated cyclic groups having from three to eight carbon atoms, such as y P I- n n o he pharmacists art. I cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohe tyl, Allthe compounds of this nventlon also exhibit antibacteriand cyclooctyl. The term heterocyclic encompasses the a] acnvlty agamst 'f p f: 90cc], Such as l y monocyclic 5- and 6-membered hetero rings having at least Wells gram nfigatlvbacluly Such as @011- TO use the one hetero atom in the ring which may be either nitrogen, oX- compounds as amlbi lcter "115, formulated from 1 f 10 ygen or sulfur. Representative heterocyclics falling within this Percent y Welght with a ?8 y acceptable l definition are, for example, aziridinyl, azetedinyl, pyrrolyl, Such as talc, petrolatum and applied liberally to the site inpyrrolidinyl, morpholino, thienyl, fury], pyridyl, piperidyl, infected w1t h the susceptible bactenadolyl, and the like. Additionally, these 5- and fi-membered AC Or mg t the pr cesses of thlS Invention, the above heterocyclics may have further substituents in their ring porcompounds can be prepared by methods depicted as follows;

A 1 N N 2-PrOH 1 R1(CHz)nNH 114+ -SOH 12 -so1r R (OHz) -N- +3,

IT .HX II\] N IHX R5 H R. N j

RFN I In the above, X is an anion, such as the halides, for example, fluoride, chloride, iodide, bromide, or other anions such as, sulfate, nitrate, phosphate, maleate, fumarate and the like.

Generally speaking, in the above process identified as A to 3 J, the starting materials are allowed to react together with 2- Rn propanol, preferably under reflux conditions and in the absence of atmospheric air. The resulting compounds are BI (CHZ) n-NH Rr+ N(C2H5)3X recovered from the reaction mixtures either in the form of free I [CH;S1-I] Z-PrOI-I base or in the form of the HX salt by methods well known to 'HX the art, such as for example, recrystallization techniques.

N The free base of this invention can be converted to its corf responding pharmaceutically acceptable 'acid addition salts. 4 Exemplary of nontaxic acid addition salts are those formed R1 with acetic, maleic, fumaric, succinic, tartaric, citric, malic, l +11, 40 cinnamic, sulfonic, hydrochloric, hydrobromic, sulfuric, phosphoric and nitric acids. The acid addition salts may be I EX prepared in the conventional manner by treating a solution or N suspension of the free base in an organic solvent with the desired acid, and then recovering the salts which form by crystallization techniques.

4 In the above reaction diagrams (A to J), starting amines are known compounds and are commercially available from sources such as Aldrich Chemical Company and they can also R R2 be prepared by known methods such as those outlined in 1 N 2-Pr0 Synthetic Organic Chemistry by R. B. Wagner and H. D.

R1-(CHY N H Nwflmx- H Zook, John Wiley & Sons, Inc., New York, New York 1953, p.

] ICH SH] 653.

The Z-methylmercaptoimidazol-Z-ines starting compounds RFN N are prepared according to procedures such as those outlined in s. R. Aspinall and E. J. Bianco, J. Org. Chem., 73, 602 -I (1951), W. Wilson, J. Chem. Soc. 1389 (1955), A. L. Langis R and F. Herr, Can. 736,494 (June X4, 1966), C. A. 65, 12212 N- (1966). The starting triethyl[l-(2-imidazolin-2-yl)-2- R1 (CH2)D N +114 imidazolin-2-yl]ammonium iodide hydroiodide methanethiol and I-(Z-imidazolin-Z-yl)-2-(methylthio)-2-imidazoline HX hydroiodide are prepared by the following reaction schemes: R N N I H. r;

Iii

The following examples are included in order further to illustrate the invention.

EXAMPLE 1 Anal. for c l-l lN o z Calcd:

C 43.16 H 5.43 [28.50 N 15.73 Found: C 43.45 H 5.45 l 28.63 N 15.43

EXAMPLE 2 2-[ Cyclopropylrnethyl )amino l 2-imidazolin-2-yl )-2- imidazoline hydroiodide A solution of cyclopropylmethylamine (1.43 g, 0.0200 mol), triethyl [l-(Z-imidazolin-Z-yl)-2-imidazo1in-2-yl] ammonium iodide hydroiodide methanethiol (9.86 g, 0.0182 mol) and freshly distilled (from calcium hydride) 2-propanol (30 ml) was heated under reflux for 1 hour and allowed to cool to room temperature. The solid was collected and recrystallized from 90 percent 2-propano1-water; yield 2.7 g

(35 percent) of the imidazoline hydroiodide, mp 238.0239.0

C. dec.

Anal. for C H lN z Calcd: C 35.82 H 5.37 l 37.92 N 20.90 Found: C 35.72 H 5.40 l 37.87 N 20.84

EXAMPLE 3 l-( 2-{[ 1(2-lmidazolin-2-yl )-2-imidazolin-2-yl]amino}ethyl) indole hydroiodide A solution of 1-( 2-aminoethyl)-indole (3.24 g, 0.0200 mol), triethyl [l-(Z-imidazolin-Z-yl)-2-imidazolin-2-yl] ammonium iodide hydroiodide methanethiol (9.87 g, 0.0182 mol) and redistilled (from calcium hydride) 2-propanol 50 ml) was heated under reflux for 30 minutes and allowed to cool to room temperature. The solid was collected. Recrystallization from percent 2-propanol-water afforded 3.60 g (42.0 percent) of the imidazoline. hydroiodide, mp 228.0229.0 C.

dec.

Anal. for C,,H,,1N,:

Calcd: C 45.29 H 4.99 129.91 N 19.81 Found: C 45.38 H 5.00 129.70 N 19.60

EXAMPLE 4 3-(2-{[ l-2-(1midazolin-2-yl)-2-imidazolin-2-yl]amino} ethyl) indole hydroiodide.

A solution of tryptamine (6.40 g, 0.0400 mol), 2-methylmercaptoimidazol-2-ine hydroiodide (19.5 g, 0.0800 mol), triethylamine (4.05 g, 0.0400 mol) and 2-propan0l (freshly distilled from calcium hydride, 35 ml) was heated under reflux for 2 hours and then allowed to cool to room temperature. The solid was collected and recrystallized from 90 percent 2- propanol-water; yield 3.39 g (20.0 percent) of the imidazoline hydroiodide, mp 256.0-257.0 C. dec.

Anal. for C, 1N Calcd: C 45.29 H 4.99 [29.91 N 19.81 Found: C 45.43 H 4.98 l 30.03 N 19.97

EXAWLE 5 3 2-{[ l-( 2-lmidazolin-2-yl )-2-imidazolin-2-yl amino} ethyl 5methoxyindole hydroiodide A solution of S-methoxyindole (5.70 g,0.0300 mol), 2-mercap1omethylimidazol-2-ine hydroiodide (14.6 g, 0.0600 mol), triethylamine (3.04 g, 0.0300 mol) and freshly distilled (from calcium hydride) 2-propanol 30 ml) was heated under reflux for 2 hours and allowed to cool to room temperature. The precipitate was collected and recrystallized from 80 percent ethanol-water; yield 2.50 g (20.0 percent) of the imidazoline hydroiodide, mp 270.027 1 .0 C. dec.

Anal. for C H lN O:

Calcd: C 44.94 H 5.10 127.93 N 18.50 0 3.52 Found: C 45.00 H 5.06 128.1] N 18.55 0 3.79

EXAMPLE 6 2-[(4-Chlorophenethy1)amino]-l-(2-imidazolin-2-yl)-2- imidazoline hydroiodide A solution of 2-(4-chlorophenethyl)amine (3.83 g, 0.0250 mol), triethyl[l-(2-imidazolin-2-yl)-2-imidazolin-2-yl] ammonium iodide hydroiodide methanethiol (12.2 g, 0.0226 mol) and freshly distilled (from calcium hydride) 2-propanol 100 ml) was heated under reflux for 7 minutes and allowed to cool to room temperature. The solid was collected and recrystallized from percent 2-propanol-water; yield 4.83 g (46.0 percent) of the imidazoline hydroiodide, mp l97.0-1 99.0 C. dec.

Anal. for C H CllN z Calcd: C 40.07 H 4.56 Cl 8.45 l 30.24 N 16.69 Found: C 40.21 H 4.65 Cl 8.65 1 30.10 N 16.81

EXAMPLE7 2-l 3,4-Dihydroxyphenethyl )amino]- 1 2-imidazolin-2-y1)-2- imidazoline hydrochloride A solution of 3-hydroxytyramine hydrochloride (5.69 g,

0.0300 mol), Z-methylmercaptoimidazol-2-ine (6.96 g,,

0.0600 mol) and 2-propanol (distilled from calcium hydride, 100 ml) was heated under reflux for 1 hour while a stream of nitrogen was slowly bubbled through the solution. The reaction mixture was allowed to cool to room temperature. The solid was collected and recrystallized from 95 percent 2- propanol-water; yield 2.37 g (27.0 percent) of the imidazoline, mp 233.0234.0 C. dec.

Anal. for C ll ClN O z Calcd:

C51.6l H619 Cl 10.88 N21.50 Found: C 51.53 H 6.18 Cl 10.86 N 21.60

EXAMPLE 8 Anal. for C H 1N S:

Calcd: C 26.93 H 4.20 140.65 N 17.95 Found: C 27.22 H 4.16 1 40.79 N 17.84

EXAMPLE 9 l-(2-lmidazolin-2-yl)-2-(3-indol-3-ylpropy1amino)-2- imidazoline hydroiodide A solution of homotryptamine (5.22 g, 0.0300 mol), 2- methylmercapto-2-imidazoline (3.48 g, 0.0300 mol), 2-

methylmercapto-Z-imidazoline hydroiodide (7.32 g, 0.0300

mol), and 2-propano1 (distilled from calcium hydride, 70 ml) was heated under reflux for 1 1% hours while a stream of nitrogen was bubbled through the reaction mixture. The solution was allowed to cool to room temperature. The solvent was evaporated. Trituration of the residual oil with 2-propanol (100 ml) followed by recrystallization from 95 percent 2- propanol-water afforded 1.95 g (15.0 percent) of the imidazoline, mp 160.0-.-162.0 C.

Anal. for C H IN Calcd:

C 46.58 H 5.29 l 28.95 N 19.17 Found: C 46.84 H 5.33 1 28.85 N 19.39

EXAMPLE l l-(2-lmidazolin- 2-y1 )-2-( 2-indanylamino )2-imidazoline hydrochloride A solution of 2-aminoindan hydrochloride (13.6 g, 0.0800 mol), 2-methylmercaptoimidazol-2-ine (18.7 g, 0.160 mol) and 2-propanol (distilled from calcium hydride, 120 ml) was heated under reflux for 1 hour while a stream of nitrogen was bubbled through the reaction mixture. The solution was allowed to cool to room temperature. The solid was collected and recrystallized from 95 percent 2-propanol-water; yield 4.6 g 19 percent) of the imidazoline, mp 248.0249.0 C.

Anal. for c n cim:

Calcd:

C 58.91 H 6.59 Cl 11.59 N 22.90 Found: C 58.64 H 6.81 Cl 11.29 N 22.94

EXAMPLE 1 1 2-Anilino-1-(Z-imidazolin-Z-yl)-2-imidazoline A solution of freshly distilled aniline (9.3 g, 0.10 mol), 2- methylmercaptoimidazol-Z-ine hydroiodide (24.4 g, 0.100 mol), 2-methylmercaptoimidazol-2-ine (11.6 g, 0.100 mol) and 2-propanol (distilled from calcium hydride, ml) was heated under reflux for 3 hours while a slow stream of nitrogen was bubbled through the solution. The reaction mixture was concentrated. The residue was treated with 20 percent sodium hydroxide solution and extracted with methylene chloride (5 X ml-portions). The organic extracts were washed with water, dried over anhydrous sodium sulfate, filtered and evaporated under reduced pressure. The amorphous residual solid was extracted with boiling ether (4 X 750 mlportions). Evaporation of the solvent followed by recrystallization of the residue from benzene gave 5.2 g (27 percent) of the imidazoline, mp l75.5l 76.5 C. dec.

Anal. for C H N Calcd: C 62.86 H 6.60 N 30.55 Found: C 63.13 H 6.67 N 30.43

EXAMPLE l2 Anal. for C I-1 1,19 5:

Calcd: C 28.85 H 5.40 [46.89 N 12.94 S 5.92 Found: C 28.98 H 5.42 1 46.76 N 12.79 S 5.94

EXAMPLE 13 l 2-1midazo1in-2-yl )-2- 2-(2-pyridyl )ethy1]amino} -2- imidazoline hydroiodide A solution of 2-(2-aminoethyl)pyridine (3.91 g, 0.0320 mol l-( Z-imidazolin-Z-yl )-2-( methylthio )-2-imidazoline hydroiodide (9.98 g, 0.0320 mol) and freshly distilled (from calcium hydride) Z-propanol ml) was heated under reflux for 3 hours while a slow stream of nitrogen was bubbled through the reaction mixture. The reaction mixture was allowed to cool to room temperature. The resulting solid was collected and recrystallized from 2-propanol (three times); yield 3.77 g (30.6 percent) of the imidazoline; mp 153.0-l 54.0'C.

Anal. for C I-1 .114 Calcd:

c 40.43 H 4.96 132.86 N 21.76. Found: c 40.69 H 5.02 1 32.99 N 21.94

EXAMPLE l4 4-(2-Aminoethoxy)-3,S-dimethylbenzophenone hydrochloride 7 A solution of 3,5-dirnethyl-4-(2-phthalimidoethoxy) benzophenone (20.0 g, 0.0500 mol), 99 percent hydrazine hydrate (10.3 g, 0.200 mol) and absolute ethanol (1400 ml) was heated under reflux for 27 hours and then evaporated to dryness under reduced pressure. The residue was partitioned between 1N hydrochloric acid (500 ml) and ether (500 ml).' The interfacial material was collected and washed with ether. The layers were separated and the organic phase was extracted with 1N hydrochloric acid (2 X 250 ml). The combined aqueous extracts were basified with 50 percent sodium hydroxide solution and extracted with methylene chloride (4 X 250 ml). The combined organic phase was dried over anhydrous sodium sulfate and filtered. Evaporation of the filtrate gave 13.4 g of a yellow oil which was dissolved in anhydrous ether and treated with hydrogen chloride. The solid was collected and recrystallized from acetonitrile and then ethanolacetonitrile; yield 8.70 g (57.0 percent) of the amine hydrochloride; mp l85.5-187.0 C. dec.

- Calcd:

(150 ml) wa added and the Anal. for C,-,H ClNO- Calcd: C 66.77 H 6.59 Cl 11.59 N 4.58 O 10.46 Found: C 66.88 H 6.60 Cl 11.75 N 4.79 O 10.51

EXAMPLE Anal. for C H IN C 43.65 C 43.95

EXAMPLE 16 2-( Benzylamino)- l-( 2-imidazolin-2-yl )-2-imidazoline hydroiodide A solution of benzylamine (10.7 g, 0.100 mol), 2-methylmercaptoimidazol-Z-ine hydroiodide (24.4 g, 0.100 mol), 2-

Found:

'methylmercaptoimidazol-Z-ine (11.6 g, 0.100 mol) and freshly distilled (from calcium hydride) 2-propanol (100 ml) was heated under reflux for 2 hours while a slow stream of nitrogen was passed through the reaction mixture. The solution was concentrated to one-fourth of its original volume and allowed to stand at room temperature for 4 days. 2-Propanol precipitate was collected. Recrystallization from 2-propanol gave 6.50 g (17.0 percent) of the imidazoline hydroidide; mp 187.0-l 89.0 C.

Anal. for C l-l lN z Calcd C 42.06 H 4.89 l 34.19 N 18.87 Found: C 42.31 H 5.01 1 34.28 N 19.13

EXAMPLE l7 1-( 2-Imidazolin-2-yl )-2[ (trans-2-phenylcyclopropyl )aminoI- 2-imidazoline maleate A solution of hydrochloride (9.3 5 g, toimidazol-2-ine 12.8 g,

trans-2-phenylcyclopropylamine 0.0550 mol), 2-methylmercap- 0.110 mol) and freshly distilled (from calcium hydride) 2-propanol 125 ml) was. heated under reflux for 5 hours and then concentrated under reduced pressure. The residue was partitioned between percent potassium hydroxide solution and methylene chloride. The organic extracts were dried over anhydrous sodium sulphate, filtered and evaporated. Trituration of the residue with etherpentane gave a white powder (5.47 g). A portion of the white powder (4.01 g) was dissolved in 2-pr0panol ml) and added to a solution of maleic acid (1.73 g) in 2-propano1 (30 ml). The precipitate was collected and recrystallized from 2- propanol; yield 4.07 g (15.0 percent) of the irnidazoline maleate; mp l90.0191.0 C.

Calcd: C 59.12 H 6.01 N 18.17 016.60 Found: C 59.04 H 6.21 N 18.36 0 16.60

EXAMPLE l8 2-({ 1-( 2-lmidazolin-2-yl )-2-imidazolin-2-yl ]amino} methyl pyridine hydroiodide A solution of 2-aminomethylpyridine (3.61 g, 0.0330 mol), triethyl[ 1-(2-imidazolin-2-yl)-2-imidazolin-2-yl] ammonium iodide hydroiodide methanethiol (18.0 g, 0.0330 mol) and freshly distilled (from calcium hydride) 2-propanol (110 ml) was heated under reflux forv 2 hours while a slow stream of nitrogen was bubbled through the reaction mixture. The precipitate was collected and recrystallized from 90 percent 2- propanol-water; yield 6.05 g (50.0 percent) of the imidazoline Q hydroiodide; mp 193.0l94.0 C. dec.

Anal. for C H IN Calcd: C 38.72 H 4.60 [34.09 N 22.58 Found: C 38.88 H 4.68 133.97 N 22.57

EXAMPLE l9 2-{[2-(4-Benzoyl-2,6-dimethylphenoxy)ethyl]amino}-l-(Z- imidazolin-Z-yl)-2-imidazoline hydrochloride A solution of 4-( 2-aminoethoxy )-3 ,S-dimethylbenzophenone hydrochloride (6.12 g, 0.0200 mol), 2-methylmercaptoimidazol-Z-ine (4.64 g, 0.0400 mol) and freshly distilled (from calcium hydride) 2-propanol (50 ml) was heated under reflux for 22 hours while a slow stream of nitrogen was bubbled through the reaction mixture. Ether was added to the reaction mixture at room temperature. The solid was collected and washed with cold ether-Z-propanol. Recrystallization from 2-propanol afforded 1.30 g (15.0 percent) of the imidazoline hydrochloride, mp 213.0214.5 C. dec.

Anal. for C,;,H,,C1N -,O,:

Calcd: C 62.51 Found: C 62.37

EXAMPLE 20 2-(n-Decylamino)-1-(2-imidazolin-2-yl)-2-imidazo1ine hydroiodide A solution of n-decylamine (6.61 g, 0.0423 mol), l-(2- imidazolin-Z-yl)-2-(methyltl'1io)-2-imidaz1oline hydroiodide (13.1 g, 0.0420 mol) and freshly distilled (from calcium hydride) 2-propanol (55 ml) was heated under reflux for 5 hours and then concentrated to about two-thirds of the original volume. The precipitate was collected and recrystallized from benzene; yield 3.54 g (20.0 percent) of the imidazoline hydroiodide; mp l29.0-l 3 1 .0 C. dec.

Anal. for C H N Calcd C 45.61 H 7.65 130.12 N 16.62 Found: C 45.47 H 7.72 130.12 N 16.87

EXAMPLE 21 Anal. for C l-l lN z Calcd:

Found:

We claim: 1. A compound of the formula:

HN N

wherein N is 0,1,2 or 3.

2. A compound according to claim 1 which is 1-(2- imidazolin-2-yl)-2- {[2-( 2-pyridyl)ethyl]amino} -2- imidazoline.

3. A compound according to claim 1 which is 2-({[l-(2- imidazolin-2-yl)-2-imidazolin-2-yl]amino}methyl)-pyridine. 

2. A compound according to claim 1 which is 1-(2-imidazolin-2-yl)-2-((2-(2-pyridyl)ethyl)amino)-2-imidazoline.
 3. A compound according to claim 1 which is 2-(((1-(2-imidazolin-2-yl)-2-imidazolin-2-yl)amino)methyl)-pyridine. 